People who send a lot of unwanted messages, especially by email or on the internet.
Spammers are usually seen as annoying and not welcome.
Examples:
The spammers keep sending me emails about things I don't want.
We don't like spammers because they send too many messages.
The spammers are always trying to sell us things we don't need.
The spammers are like the people who keep calling during dinner.
The spammers send so many messages, it's like they never stop.
The spammers are like the people who put too many flyers in our mailbox.